1. /*
  2. * Copyright 1999-2004 The Apache Software Foundation
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. * http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. package org.apache.commons.jxpath.servlet;
  17. import org.apache.commons.jxpath.Variables;
  18. /**
  19. * Implementation of the Variables interface that provides access
  20. * to a single object using a reserved name (keyword).
  21. *
  22. * @author Dmitri Plotnikov
  23. * @version $Revision: 1.6 $ $Date: 2004/02/29 14:17:40 $
  24. */
  25. public class KeywordVariables implements Variables {
  26. private String keyword;
  27. private Object object;
  28. public KeywordVariables(String keyword, Object object) {
  29. this.keyword = keyword;
  30. this.object = object;
  31. }
  32. public boolean isDeclaredVariable(String variable) {
  33. return variable.equals(keyword);
  34. }
  35. public Object getVariable(String variable) {
  36. if (variable.equals(keyword)) {
  37. return object;
  38. }
  39. return null;
  40. }
  41. public void declareVariable(String variable, Object value) {
  42. throw new UnsupportedOperationException(
  43. "Cannot declare new keyword variables.");
  44. }
  45. public void undeclareVariable(String variable) {
  46. throw new UnsupportedOperationException(
  47. "Cannot declare new keyword variables.");
  48. }
  49. }